Dithering with APT and PHD2

[simmo39]

I have been using both PHD and APT for a few years and have got good guiding, As im waiting for some good clear sky to go outside and play I got around to thinking about dithering as my last Ha run had a lot of walking noise ( more than usual ) so i thought i would give dithering a go on my next session. My main question is. I usually take 240s subs for most targets do i need to dither between each one or is there some magic ratio?

Thanks in advance.

[tooth_dr]

10 minutes ago, simmo39 said:

I have been using both PHD and APT for a few years and have got good guiding, As im waiting for some good clear sky to go outside and play I got around to thinking about dithering as my last Ha run had a lot of walking noise ( more than usual ) so i thought i would give dithering a go on my next session. My main question is. I usually take 240s subs for most targets do i need to dither between each one or is there some magic ratio?

Thanks in advance.

I would dither between each sub, if 300s or longer, you could do the same or even dither every other one. 

[simmo39]

3 minutes ago, tooth_dr said:

I would dither between each sub, if 300s or longer, you could do the same or even dither every other one. 

Thanks for the reply, I will try ( Weather permitting ) every other one first as i dont want to eat into my time on target to much.

[tooth_dr]

1 hour ago, simmo39 said:

Thanks for the reply, I will try ( Weather permitting ) every other one first as i dont want to eat into my time on target to much.

No problem.  I think every other one should be ok, as with 4 minute subs, you would lose too much % of time.  Some of the guys using the new CMOS cameras dither every 5 subs due to short exposure times.

[simmo39]

Hi, for those of you like me who had thought dithering was a black art it aint! did my first go with it last night and it worked like a dream, Thanks Tooth dr for the pointers.